Spring-rocker.



A. W. SCHRAM.

SPRING ROCKER.

APPLICATION FILED DEc.2. m4.

Patented Aug. 17, 1915.

UMBIA PLANOGRAPH COUW'ASMINUTON, D- C.

g PATNT @Fltd.

ADOLPH W. SCHRAIVI, OF OSHKOSH, WISCONSIN.

SPRING-ROCKER.

Specification of Letters Patent.

Patented Aug. 1'2, 19.15.

Application filed December 2, 1914. Serial N 0. 875,175.

To all whom it may concern:

Be it known that I, AnoLPH W. SCHRAM, a citizen of the United States, and resident of Oshkosh, in the county of Winnebago and State of Visconsin, have invented certain new and useful Improvements in Spring-Rockers; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention consists in what is herein particularly set forth with reference to the accompanying drawings and pointed out in the claims of this specification, its object being to improve spring-rockers embodying asuitable base, convolute springs connected at their inner ends to the base, and a superstructure in union with the outer ends of the springs, the improvements being designed to cushion rear rock of the superstructure, prevent upsetting of the rocker and insure against injury to the user.

Figure 1 of the drawings represents a side elevation-of the'major portion of a chair embodying my improvements and partly broken away; Figs. 2 and 3, are sectional views respectively indicated by lines 22 and 3-8 in Fig. 1, and Fig. 4 is a side elevation of a clamp element of my invention on bolts that appear in cross-section.

Referring by numerals to the drawings, 5 indicates one of. a'pair of parallel standards, 6 rear rounds of a chair-base and 7 a front crosspiece of said base.

An approximately straight and vertically disposed central portion 8 of a convolute spring-rod is caught in a suitable parting clamp 9 rigidly connected to the inner side of the base-standard, and the remainder of the rod is coiled from the extremes of said central portion thereof in the same direction.

One end 10 of the spring is approximately horizontal and higher than its other end that is bent in the form of an upwardly open hook 11, and said higher end of said spring is clamped in connection with the inner side of a side bar 12 of a seat-frame constituting part of the superstructure of the chair.

While my improvements have particular reference to chairs, they are just as applicable to cradles, cribs and other manufactures each of which comprises a base and superstructure in union with one or more convolute springs to constitute a springrocker.

The clamp 9 is curved at one end in conformity to a bend of the spring engaged therewith to avoid fracture of said spring due to sudden contraction and expansion of coils thereof. Otherwise said clamp is one of well known construction, but the clamp for the highest end of said spring is of novel construction and connection with the rocking superstructure.

The upper clamp comprises a pair of parallel gripping-blocks 18 and 14 held together on the horizontally disposed end of the spring by bolts 15 and nuts 16. The bolts are vertically alined and have angular shanks thereof engaging corresponding openings in a circular or other preferred form of shell 17 fastened by screws 18 or other suitable means in a corresponding mortise with which the superstructure is provided. The clamp-block 13 has a central pivot-lug 19 with which the shell 15 engages, and the bolt-holes in said block are on arcs of a circle. The bolt-holes in the clamp-block 14 are large enough to provide for clearance of the bolts when the superstructure is pivotally adjusted, and an arm 20 of the clamp-block 13 has its outer end provided with a vertically disposed slot on an arc of a circle engaged by a bolt 21 on which a nut 22 is run against a washer 23.

The bolt 21 has angular fit in a sleeve 24 provided with outer suitably spaced ribs 25 and said sleeve engages a mortise in the superstructure. The ribs of the sleeve are driven into the superstructure to hold said sleeve against turning. The nut 22 being loosened, the superstructure may be pivotally adjusted to level the same, in case the uppermost portion of the spring is not perfectly horizontal, or it may be desirable to have said superstructure somewhat tilted eitherforward or back with respect to a perfectly horizontal disposition of said portion of said spring.

The free hook end of the spring is in the rear rocking path of a lateral lug 26 of the clamp-block 14 and contact of the two occurs when the superstructure isrocked backward to a greater than ordinary extent, particularly in the case of an unusually heavy person occupying the chair. The compression of the supplemental emergency coils of the spring cushions the more than ordinary backward rock of the superstructure, whereby a sudden,

startling and tendency to upset movement of said superstructure is prevented, and their reaction aids the reverse rock of said superstructure.

I claim:

1. The combination of a base, a superstructure, a spring-rod that is doubled and shaped to provide a vertically disposed approximately straight central portion fastened to the base and the remainder thereof convolutely coiled in the same direction from the extremes of said'central portion, the ends of the rods terminating adjacent each other, one of said ends being free, and the other end being disposed in a horizontal plane, means by which the superstructure is fastened to the horizontal end of the spring, and a lug with said superstructure arranged to operate at times against the free end of said spring.

2. The combination of a base, a superstructure, a spring-rod having a vertically disposed approximately straight central portion fastened to the base and the remainder thereof convolutely coiled in the same direction from the extremes of said central portion, one end of the spring being free and hook shaped, the other end being disposed in a substantially horizontal plane, means by which the superstructureis fastened to the horizontal end of the spring, and a lug with said superstructure arranged to operate at times against the hook-shaped free end of said spring.

3. The combination of a base, a superstructure, a spring-rod that is doubled to form a vertically disposed approximately straight central portion fastened to the base and the remainder thereof convolutely coiled in the same direction from the extremes of said central portion, a clamp connecting the superstructure with one end of the spring, and a lug extending from the clamp to operate at times against the other and free end of said spring, said free end being normally in a plane below the clamped end of the spring.

4:. The combination of a base, a superstructure, a spring-rod that is doubled to provide a vertically disposed approximately straight central portion fastened to the base and the remainder thereof convolutely coiled in the same direction from the extremes of said central portion, a clamp on an approximately horizontal end of the spring and withwhich said superstructure has pivotally adjustable connection, and a lug with said superstructure arranged to operate at times against the other and free end of said spring that is normally below the end aforesaid.

5. The combination of a base and a superstructure, a spring having a central portion fastened to the base, a shell fast in the superstructure, a pair of clamping-blocks one of which has a central pivotlug engaging the shell, bolts in anti-turning engagement with said shell and extending through clearance apertures in both clamping-blocks, nuts run on the outer ends of the bolts to tighten said blocks on an approximately horizontal end of the spring, an arm-extending from the innermost clamp-block and provided at its outer end with a vertically disposed slot on an arc of a circle, a sleeve rigidin the superstructure, an anti-turning bolt extending through the sleeve and arm-slot into a binding-nut, and a lug with said superstructure arranged to operate at times against the other and free endof said spring that is normally below the end aforesaid.

In testimony that I claim the foregoing I have hereunto set my hand at Oshkosh in the county of Winnebago and State of Wisconsin in the presence of two witnesses.

ADOLPH W SGHRAM.

Witnesses E. J. GLA'rz, H. Ennns.

Copies of this patent may be obtained for five cents eachfby addressing the Commissi n of patent Washington, D. G. 

